A Sample Contains Ba₃(PO₄)₂, CdS, AgCl, NH₄Cl, and ZnS

Multiple Choice

A sample contains Ba₃(PO₄) ₂, CdS, AgCl, NH₄Cl, and ZnS. Identify the soluble salt remaining in the solution after the addition of 6 mol L^-1 HCl, followed by the addition of H₂S and 0.2 mol L^-1 HCl, then the addition of OH^- to a pH of 8, and finally the addition of (NH₄) ₂HPO₄ with NH₃.

A) Ba₃(PO₄) ₂
B) CdS
C) AgCl
D) NH₄Cl
E) ZnS